How to add timestamp to bash after completed command

Question

I would like to add the current time upon execution of a bash command. I would like it to be in the right hand site so not to be intrusive. The output I am looking for is:

batman@Batcave:~/grails$ ls -l
total 84
drwxr-xr-x 2 batman batman  4096 2011-02-16 09:54 bin
drwxr-xr-x 2 batman batman  4096 2011-02-16 08:24 scripts
drwxr-xr-x 9 batman batman  4096 2011-02-16 08:24 src
batman@Batcave:~/grails$                                                       **10:46:06**

ideas on how to accomplish this??

Answer 1

Something similar, but not exactly, what you ask: add the following lines to your ~/.bashrc

mytime() {
    printf '%*s**%s**\n' $((COLUMNS-13)) "" "$(date +%T)"
}
PROMPT_COMMAND=mytime

The difference is that the time is shown on the previous line, not the current.
I think it should be difficult to write on the current line without interfering with the shell prompt and line editing.